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a measure of the degree to which the total phenotype variance is the result of genetic differences and thus can be influenced by selection
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row ...

Variability in polygenic traits can result from genetics and also from the environment. A measure of the relative contribution of genetics is called heritability.

Heritability: The proportion of the total phenotypic variance that is attributable to hereditary variance (h2= genetic variance / total phenotypic variance). A high h2 does not mean that the trait cannot be influenced by environment.

While some behaviors are indeed attributable to a single gene, most behavioral traits are polygenic, or influenced by several genes. Further, more often than not, the environment will mediate the affects of those genes.

[edit] Heritability
Aggression, as well as other behavioral traits, is studied genetically based on its heritability through generations.

H#178;. The proportion of total phenotypic variance at the population level that is contributed by genetic variance (also called heritability in the broad sense).

- A measure of resemblance between relatives. In the broad sense,
Histone ...

heritability (in the narrow sense)A measure of the extent to which genes inherited from parents determine phenotypes; defined as the ratio of the additive genetic variance to total phenotypic variance; also called realized heritability.

genetic factors — tall parents tend to have tall children
or — most likely — both.
Heritability ...

The infectivity and heritability of yeast prions and the ease of yeast manipulation as exemplified by the work of Vishveshwara and Liebman [8] make possible detailed studies of different amyloid forms, ...

In Darwin's time, there was no widely accepted in-depth mechanism for heritability.

Numerous scientists during Mendel's time were studying the heritability of various traits. However, much of this science was descriptive and qualitative.

Genomic imprinting (which is "epigenetic") constitutes heritability that is not coded in DNA. Evolution is prevalent also in viruses, although these are not considered to be organisms. The genetic material in viruses may consist of DNA or RNA.

Types of mutation explained (chromosomal and gene) OR given in terms of heritability i.e. germ cf. somatic cell mutation;
Cause of mutation (high energy radiation/ particles OR named chemical mutagen); ...

Heritability — The proportion of phenotypic variation that is explained by genetic factors.
Heteroplasmy — The occurrence in a single cell of more than one population of mitochondrial DNA sequence.

See also: See also: Organ, Trait, Species, Population, Environment

Biology  Heredity  Hermaphrodite

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